Kate recently teamed up with her BFF & Baby co-star Rachel Bilson, who worked on a pair of gold-plated amethyst earrings for Kate‘s JewelMint line.

The Rachel Earrings retail for $29.99 and from April 15 to June 15, 50 percent of the proceeds will benefit Invisible Children, a charity devoted to ending the abduction of children for use as child soldiers.